In their defense, they were there for days with apparently vegetation as the planet's only form of life.

You would think they wouldn't let their stuff be unguarded when they found water.
Velvet Voice

Similar to Zira's astonishment at Taylor using an old blanket as clothing, when the wild humans are all wearing various types of rags and animal skins.

With regard to shaving I like how his ladypiece is fascinated by him shaving, whilst being waxed and preened to within an inch of her life.

The houses and buildings seen like something from The Flintstones.
Aesthetics is not an indicator of technological development.

There's electricity for lighting apparently as well as running water, but where does it come from? The houses and buildings seen like something from The Flintstones.

Yes..they have advanced weaponry (rifles) but still live in mud huts with dirt floors.

I have seen this film numerous times - even in the theater when I was a small child (drive-thru, a cheap babysitter in those days!) anyway, last night I saw again, it in an actual theater TCM was showing it in several theaters throughout the country. They showed the scene you referenced and until a gentleman in the theater laughed, I had no idea what was so funny - I can't believe I missed it! It's hysterical!! Lol.
"Eventually, all things merge into one, and a river runs through it." Norman Maclean

Why doesn't Taylor realize he's on earth when the apes are speaking perfect English
They're not speaking English. He's lip reading. The "English" is just dubbed in.
I choose to believe what I was programmed to believe

Yes, that would have helped a lot!

Maybe the film should have had an extra character, one who could be with Taylor when he was captured by the apes, one who could be his brains and help him out in his decisions. That character could be called Andrew W Johnson, an expert in brushing aside any allegory and other distracting narrative issues, and getting to the heart of the bleeding obvious.

In the same way that the characters on Star Trek kept finding people on other planets who spoke English, he just thinks they happened to evolve that way. It's the way foreigners all speak English in movies, same thing.

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Why doesn't Taylor realize he's on earth when the apes are speaking perfect English,
TAG LINE: True genius is a beautiful thing, but ignorance is ugly to the bone.

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'Another solar system' must be the wrong usage since 'solar' means of our own sun. I think it should be 'another stellar system'. But anyways given how primitive the apes are, they may not know that their 'sun' is also a star. We don't even know what terminology they use to refer to their parent star..
Incorrect. The term "solar system" refers to any star and its planets. The term "stellar system" is rarely ever used by anyone.